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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Blood is approximately twice as thick as water because of the cells and other components found in it.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.